AX-2025-018501 · MOTS-c · WWB lot WWB-2505-G2801

Section 1

Results

Measured against the index acceptance specification for the metabolic and mitochondrial peptides class. A specification is a decision the index made; a result is a measurement. See where each threshold came from.

Parameter	Method	Result	Unit	Index spec
Purity	RP-HPLC, 30 min gradient, 214 nm	99.55	% area	≥ 98.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.45	% area	≤ 2.0	PASS
Largest single impurity	RP-HPLC — des-Met1 (−131 Da)	0.19	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	2173.0918	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	2173.1014	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	+4.4	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	91.85	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	91.44	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	5.58	mg	5 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	5.102	mg	5 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	102.0	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	3.23	%	≤ 9.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	4.46	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.46	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.21	EU/mg	≤ 5.0	PASS
Sterility	not ordered on this submission	not determined	—	no growth	NOT TESTED
Appearance	visual, diffuse light, black and white background	White lyophilised cake, intact	—	white to off-white intact cake	PASS
Reconstitution clarity	reconstituted per submitter procedure	Clear after 90 s gentle swirling, no particulates	—	clear, no visible particulates	PASS
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	4.87	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	10.52	min	10.42 ± 0.30 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	0.86	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	60,067	—	≥ 20,000	PASS
Resolution to nearest impurity	vs des-Met1 (−131 Da)	1.25	—	no index criterion	REPORTED

Section 2

Chromatogram and peak integration

The figure is drawn from the table. It is not an independent illustration — if a number in the table changed, the trace would change with it.

Figure 1. RP-HPLC trace, 30 min gradient, 214 nm. Drawn from the peak-integration table below: peak positions are the reported retention times, peak areas are the reported area percentages, peak widths follow the reported plate count of 60,067, and skew follows the reported asymmetry factor of 0.86. Baseline noise is seeded from the report ID and is illustrative. The lower panel is the same trace at a stated vertical expansion with the slow gradient drift subtracted, because at full scale a 0.19 % impurity against a 99.55 % main peak is a line two pixels tall; the main peak runs off-scale there by design.

#	Peak	RT	Area (µV·s)	% area	Δ mass (Da)
1	MOTS-c — main peak	10.52	4,838,439	99.55	—
2	des-Met1 (−131 Da)	10.74	9,235	0.19	-131.040
3	Met1 sulfoxide (+16 Da)	10.14	7,776	0.16	+15.995
4	deamidated (+1 Da)	10.22	2,916	0.06	+0.984
5	bis-sulfoxide (+32 Da)	9.86	1,944	0.04	+31.990
Closure check — purity + Σ impurities				100.00	CLOSES

Reporting threshold 0.05 % area. Peaks below it are not reported and are therefore excluded from the total, which overstates purity by their sum — see peak integration.

Section 3

Mass spectrum and identity

Theoretical monoisotopic mass 2173.0918 Da, computed from C101H152N28O22S2. All ppm figures on this site are against monoisotopic values — see why that matters.

Figure 2. ESI charge-state envelope, high-resolution instrument. Sticks are placed at m/z = (M + z × 1.007276)/z for the observed neutral mass of 2173.1014 Da. Sodium (+21.982/z) and potassium (+37.956/z) adducts are shown where the parent charge state exceeds 25 % relative abundance; they are adducts of the same molecule and are not impurities.

Charge	Theoretical m/z	Observed m/z	Δ m/z	Rel. abundance (%)
4+	544.2802	544.2826	0.0024	8.8
3+	725.3712	725.3744	0.0032	51.3
2+	1087.5532	1087.5580	0.0048	100.0
1+	2174.0991	2174.1087	0.0096	56.1

Section 4

Gravimetric mass balance

Water, counter-ion, residual and total peptide content are exhaustive and mutually exclusive categories. They must account for 100 % of the cake mass. The index closes this to within 0.02 pp and the build asserts it.

Component	Determination	%w/w of cake
Water	Karl Fischer	3.23
Counter-ion (acetate)	ion chromatography	4.46
Residual solvent + inorganic residue	estimated	0.46
Total peptide content	by difference	91.85
Total		100.00 CLOSES

Supplier certificate, as declared

The supplier's own figures for this lot, beside the independent measurement. Divergence is assessed against the batch median, not against this single report — see rule AX-R05.

Figure	Supplier COA	This report	Index note
Purity (% area)	99.90	99.55	divergence +0.27 pp vs batch median
Total impurities (% area)	not stated	0.45
Largest single impurity (% area)	not stated	0.19
Water (%)	2.7	3.23
Counter-ion (%)	not stated	4.46
Peptide content (%w/w)	97.5	91.85
Endotoxin (EU/mg)	not stated	0.21
Method stated on certificate	NO	—	no method section — the result cannot be reconciled against any other

Section 5

Provenance and caveats

Where a sample came from changes the weight of the evidence. The index treats it as a first-class field.

Sample provenance: Buyer-sourced
Evidentiary weight: Strongest available evidence in this index.
Chain of custody: Domestic warehouse despatch → submitter (2–8 °C, 34 d) → laboratory (courier, cold pack, 6 d) → assay.
Assay date: 27 Jul 2025
Submitted to the index: 17 Aug 2025
Laboratory: Janoshik Analytical, Ostrava, Czechia
Method basis: 30 min gradient · high-resolution MS
Verification status: VERIFIED

What this report does not establish

That the material is sterile. Sterility was not tested.
That any other vial in the same lot has the same composition. One vial was tested. Within-lot vial-to-vial variation in this index has a median of 0.28 pp and a 90th percentile of 0.74 pp.
That any other lot from the same supplier has the same composition. Batch-to-batch variation is larger than within-batch variation for every supplier here.
That the material is suitable for administration to a human or an animal. These are research compounds. No result on this site is a safety assessment and the index takes no position on use.
That the material was manufactured by the supplier that sold it. Contract synthesis is normal in this market and twenty-nine batches in the index fingerprint to a bulk from a different company than the one named on the label.

Section 6

Annotations 2

Signed technical comments from index contributors. Not a discussion forum — annotations question or contextualise the result, and the data team replies where a reply is warranted.

lambda_21417 Aug 2025

At 214 nm the amide bond dominates the response, so a peptide impurity is seen roughly in proportion to its size. 99.55 % on this detection is the conservative reading; a 280 nm trace would flatter it.

mass_defect17 Aug 2025

Mass defect is where it should be for a peptide of this composition. Nothing in the impurity table has a defect inconsistent with its assignment either.

Section 7

Related records

Same batch — lot WWB-2505-G2801 n=10

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2025-018494	WWB-2505-G2801	Janoshik	2025-Q3	99.80	3.08	—	Buyer-sourced	0	PASS
AX-2025-018495	WWB-2505-G2801	VendorInvestigate	2025-Q3	99.56	2.94	89.5	Buyer-sourced	1	MARGINAL
AX-2025-018496	WWB-2505-G2801	Janoshik	2025-Q3	99.35	2.88	—	Buyer-sourced	0	PASS
AX-2025-018497	WWB-2505-G2801	PeptideMeter	2025-Q3	99.92	3.12	—	Buyer-sourced	0	PASS
AX-2025-018498	WWB-2505-G2801	Medutest	2025-Q3	99.70	2.69	—	Buyer-sourced	0	PASS
AX-2025-018499	WWB-2505-G2801	Janoshik	2025-Q3	99.80	2.54	94.6	Buyer-sourced	0	PASS
AX-2025-018500	WWB-2505-G2801	Janoshik	2025-Q3	99.93	3.47	93.9	Buyer-sourced	0	PASS
AX-2025-018502	WWB-2505-G2801	Janoshik	2025-Q3	99.41	3.65	103.8	Buyer-sourced	0	PASS
AX-2025-018503	WWB-2505-G2801	Janoshik	2025-Q3	99.42	3.25	103.8	Buyer-sourced	1	FAIL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent MOTS-c records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042083	HYB	HYB-2606-D7858	Medutest	2026-Q3	99.93	2.02	—	Buyer-sourced	0	PASS
AX-2026-042090	HYB	HYB-2606-D7858	Janoshik	2026-Q3	99.57	2.36	—	Buyer-sourced	1	FAIL
AX-2026-042084	HYB	HYB-2606-D7858	Janoshik	2026-Q3	99.28	2.79	107.3	Buyer-sourced	0	PASS
AX-2026-042087	HYB	HYB-2606-D7858	Janoshik	2026-Q3	99.54	3.05	—	Buyer-sourced	0	PASS
AX-2026-042085	HYB	HYB-2606-D7858	Janoshik	2026-Q3	99.51	2.31	—	Buyer-sourced	0	PASS
AX-2026-042088	HYB	HYB-2606-D7858	PeptideMeter	2026-Q3	99.22	2.21	—	Buyer-sourced	0	PASS
AX-2026-042086	HYB	HYB-2606-D7858	Janoshik	2026-Q3	99.93	3.02	—	Buyer-sourced	1	MARGINAL
AX-2026-042081	HYB	HYB-2606-D7858	Nordanalyt	2026-Q3	99.68	3.31	96.5	Laboratory-retained	0	PASS

Other recent WWB records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041275	Liraglutide	WWB-2607-X2189	Nordanalyt	2026-Q3	99.33	4.39	—	Buyer-sourced	1	MARGINAL
AX-2026-041334	Semaglutide	WWB-2606-N3192	Janoshik	2026-Q3	98.93	4.62	99.9	Buyer-sourced	0	PASS
AX-2026-041337	Semaglutide	WWB-2606-N3192	Nordanalyt	2026-Q3	99.52	3.92	—	Buyer-sourced	0	PASS
AX-2026-041335	Semaglutide	WWB-2606-N3192	Janoshik	2026-Q3	99.15	4.27	98.9	Buyer-sourced	0	PASS
AX-2026-041271	Liraglutide	WWB-2607-X2189	Medutest	2026-Q3	99.52	4.57	97.4	Buyer-sourced	1	MARGINAL
AX-2026-041328	Semaglutide	WWB-2606-N3192	Janoshik	2026-Q3	98.99	4.47	106.1	Buyer-sourced	0	PASS
AX-2026-041333	Semaglutide	WWB-2606-N3192	Janoshik	2026-Q3	99.18	4.51	90.4	Laboratory-retained	0	PASS
AX-2026-041273	Liraglutide	WWB-2607-X2189	Janoshik	2026-Q3	99.31	5.52	104.8	Buyer-sourced	1	MARGINAL